Cerithium atratum is a species of sea snail, a marine gastropod mollusk in the family Cerithiidae. Distribution The distribution of Cerithium atratum includes the Western Atlantic. Brazil Belize Description The maximum recorded shell length is 50 mm. Habitat The minimum recorded depth for this species is 0 m; the maximum recorded depth is 91 m. References External links Cerithiidae Gastropods described in 1778